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Analog Devices Inc. LT8609AJDDM#PBF
- Part No.:
- LT8609AJDDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AJDDM#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,627
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Product details
Overview
LT8609AJDDM#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and AEC-Q100 qualification for automotive applications. It delivers regulated 3.3V or 5V output (fixed version), supports 200kHz–2.2MHz switching via RT resistor, and features spread spectrum modulation for low EMI in GSM transceiver power supplies.
For engineers reviewing the LT8609AJDDM#PBF datasheet, LT8609AJDDM#PBF pinout, LT8609AJDDM#PBF application, or LT8609AJDDM#PBF equivalent, key selection criteria include ultralow IQ at light load, 150°C junction-rated DFN package with side-wettable flanks, ±7.5% power-good accuracy on fixed outputs, and compatibility with 2.2µH inductors at 2MHz operation.
Technical Context
The LT8609AJDDM#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external components. Its oscillator frequency is set by an external RT resistor (e.g., 18.2kΩ yields 2.00MHz) and supports synchronization or spread spectrum modulation via the SYNC pin.
Burst Mode operation maintains <10mVP-P output ripple while drawing only 2.5µA from VIN when regulating 12V to 3.3V at no load. The EN/UV pin provides accurate 1.05V enable threshold with 50mV hysteresis, and the TR/SS pin enables programmable soft-start and output voltage tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and RF modules without external heatsinking. |
| Quiescent Current | 2.5µA in Burst Mode - enables >10-year battery life in always-on automotive subsystems. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; 2MHz operation allows use of compact 2.2µH inductors. |
| Feedback Reference | 0.778V to 0.798V (J-grade) - tight tolerance ensures precise output regulation across temperature. |
| Power-Good Accuracy | ±7.5% on VOUT - valid PG flag assertion for fixed-output variants improves system-level fault detection reliability. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping instability. |
Pinout & Package
LT8609AJDDM#PBF uses a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND). The package supports automated optical inspection (AOI) and offers θJA = 45°C/W, enabling high-power density designs in space-constrained automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.0V–42V; requires local 1µF ceramic bypass to GND for stability and EMI reduction. |
| BST | Bootstrap supply | Connects 0.1µF capacitor to SW to drive high-side NMOS gate above VIN; no series resistor allowed. |
| SW | Switch node | Drives external inductor; must be minimized on PCB to reduce radiated EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic and drivers; not for external loading. |
| RT | Frequency setting | Resistor to GND sets oscillator frequency (e.g., 18.2kΩ → 2.00MHz); determines minimum practical inductor size. |
| SYNC | External clock interface | Ground for Burst Mode; float for pulse-skipping; 3.2V–5.0V for spread spectrum; absent on LT8609B. |
| EN/UV | Enable & UVLO control | 1.05V rising threshold with 50mV hysteresis; enables programmable input undervoltage lockout. |
| TR/SS | Soft-start & tracking | 2µA internal pull-up charges external capacitor to control output ramp rate; enables sequencing with other rails. |
| PG | Power-good flag | Open-drain output asserts high when VOUT is within ±7.5% of target; valid above 3.2V VIN regardless of EN state. |
| VOUT | Fixed output voltage | 3.3V or 5V regulated output (model-dependent); connects internal 5.9MΩ or 8.95MΩ divider; used instead of FB on fixed versions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for –40°C to +150°C junction temperature - certified for under-hood automotive applications. |
| Side-wettable DFN package | 10-lead 3mm × 3mm with exposed GND pad - enables reliable solder-joint inspection via AOI and improved thermal performance. |
| Spread spectrum modulation | 1–6kHz frequency dithering on SYNC pin - reduces peak EMI by up to 10dB without filter redesign. |
| Internal compensation | No external compensation network required - simplifies layout and reduces BOM count for cost-sensitive designs. |
| Low dropout capability | Supports high duty-cycle operation down to ~200mV dropout - maintains regulation during cold-crank events. |
Applications
| GSM Transceiver Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Providing clean, low-noise 3.3V/5V power to cellular modem ICs in telematics units. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated rail with <10mVP-P ripple and burst-mode efficiency at standby. Use Value: Meets 3GPP RF emission limits without added shielding; 2.5µA IQ extends battery backup runtime during ignition-off. |
Use Scenario: Powering microcontroller, CAN transceivers, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: Main 5V system rail generator with AEC-Q100 qualification and 150°C operation. Use Value: Survives under-hood thermal cycling; PG flag enables safe MCU reset sequencing during power-up/down. |
| Industrial IoT Sensor Node | ADAS Camera Power Management |
Use Scenario: Regulating 12V vehicle battery to 3.3V for ultra-low-power wireless sensor nodes with multi-year battery life. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in Burst Mode during sleep cycles. Use Value: 2.5µA IQ enables >10-year coin-cell operation; 45ns min-on-time supports direct 12V→3.3V conversion at 2MHz. |
Use Scenario: Generating stable 3.3V for image signal processors and MIPI interfaces in rear-view cameras. IC Role / Device Role / Timing Role: Low-EMI power source synchronized to system clock via SYNC pin to avoid beat frequencies. Use Value: Spread spectrum modulation suppresses switching noise in analog video paths; side-wettable DFN ensures solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEDDM#PBF | Junction temperature rating: –40°C to +125°C (vs. +150°C for LT8609AJDDM#PBF); identical electrical specs and pinout. | Suitable for cabin electronics but not under-hood locations requiring extended temperature operation. | Select LT8609AJDDM#PBF when AEC-Q100 Grade H/J thermal requirements apply; otherwise LT8609AEDDM#PBF reduces cost. |
| LT8609AIMSE16#PBF | 16-lead MSOP package (vs. 10-lead DFN); same J-grade temp range; includes NC pins and different pin assignments (e.g., FB retained). | Preferred where legacy MSOP footprint exists or where larger thermal pad area is needed for manual rework. | Choose LT8609AIMSE16#PBF for prototyping flexibility or thermal margin over DFN; LT8609AJDDM#PBF for volume production and AOI compatibility. |
Compared with LT8609AEDDM#PBF and LT8609AIMSE16#PBF, LT8609AJDDM#PBF uniquely combines AEC-Q100 Grade J thermal rating, side-wettable DFN for automated inspection, and fixed-output simplicity-making it optimal for high-reliability automotive power rails where space, thermal robustness, and process control are critical.
Availability
LT8609AJDDM#PBF is available at Aetrix Electronics and suitable for automotive body electronics, telematics power supplies, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8609AJDDM#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8609 family is designed for high-efficiency, low-EMI automotive and industrial DC/DC conversion, emphasizing ultralow quiescent current, wide input range, and AEC-Q100 compliance for mission-critical power rails.
FAQ
What is the maximum junction temperature specification for LT8609AJDDM#PBF?
The LT8609AJDDM#PBF is guaranteed over the full –40°C to +150°C junction temperature range per AEC-Q100 Grade J qualification. This rating is confirmed in the official Analog Devices datasheet Rev. J, Order Information table, and Absolute Maximum Ratings section - making it suitable for under-hood automotive applications where ambient temperatures exceed 125°C.
Does LT8609AJDDM#PBF support both 3.3V and 5V fixed outputs?
Yes, LT8609AJDDM#PBF is a fixed-output variant and is available in both 3.3V (LT8609AJDDM-3.3#PBF) and 5V (LT8609AJDDM-5#PBF) versions. Each uses an internal feedback divider (5.9MΩ for 3.3V, 8.95MΩ for 5V) connected to the VOUT pin - eliminating the need for external resistors and ensuring ±7.5% power-good accuracy on the regulated output.
How does the SYNC pin function on LT8609AJDDM#PBF?
On LT8609AJDDM#PBF, the SYNC pin enables three operating modes: grounded for low-ripple Burst Mode (IQ ≈ 2.5µA), floating for pulse-skipping mode, or biased to 3.2V–5.0V for spread spectrum modulation. Unlike the LT8609B, the LT8609AJDDM#PBF retains full SYNC functionality - allowing EMI reduction without sacrificing light-load efficiency.
What package type and thermal characteristics does LT8609AJDDM#PBF use?
LT8609AJDDM#PBF uses a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed GND pad (Pin 11). It has θJA = 45°C/W and θJC = 10°C/W, enabling efficient heat transfer to the PCB. The side-wettable flanks support automated optical inspection of solder joints - critical for automotive manufacturing quality assurance.
Is LT8609AJDDM#PBF pin-compatible with other LT8609A variants in the DFN package?
Yes, LT8609AJDDM#PBF shares identical pinout, footprint, and solder mask design with all other LT8609A DFN variants (e.g., LT8609AEDDM#PBF, LT8609AHDDM#PBF). The only differences are junction temperature grade (J vs. E/H) and output voltage (3.3V/5V), allowing drop-in replacement in existing layouts when thermal or output requirements change.
LT8609AJDDM#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.782V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AJDDM#PBF FAQ
1.How can I place an order for LT8609AJDDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJDDM#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8609AJDDM#PBF reliable?
The price and inventory of LT8609AJDDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AJDDM#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AJDDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJDDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJDDM#PBF?
LT8609AJDDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJDDM#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8609AJDDM#PBF?
For technical support, including LT8609AJDDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJDDM#PBF requirements.
6.How does Aetrix verify that LT8609AJDDM#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJDDM#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8609AJDDM#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AJDDM#PBF?
All LT8609AJDDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJDDM#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8609AJDDM#PBF part is unused and in its original packaging.
Return procedure for LT8609AJDDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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